Here is what I've found so far concerning educational use of SL

Here is a link to a video tutorial in SL http://blog.secondlife.com/tag/education/

Here is the SL event including John Bransford I was talking about today:
"Dr. John Bransford, prominent education psychology researcher and editor of the book How People Learn, gave his first presentation in the popular virtual world of Second Life. Dr. Bransford is the director of The Learning in Informal and Formal Environments (LIFE) Center, a National Science Foundation (NSF) Science of Learning Center. He presented his latest thoughts on different ways that virtual environment can help people learn and possibly reorganize our educational system., see http://life-slc.org/?p=382 and for the transcript go to http://www.simteach.com/wiki/index.php?title=John_Bransford_Transcript_2_October_2006

Here is a video by Jeremy Kemp at San Jose State University talking about how SJSU is using SL for distance learning http://youtube.com/profile?user=jeremykemp

Check out http://www.simteach.com/ for more info...